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glynherron

Can't find the thread -

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I think I'm going mad..

I can't find a thread that I read recently.....

It was discussing a fuel vapour smell, that was only noticable with the windows down ( I know about the fuel breather across the tanks and to the charcoal canister), and I think at full throttle.

It mentioned a one way valve? (might have been on the inlet manifold)

I thought is said that on throttle openings in excess of 95%, that if the valve were faulty it would give rise to the smell.

Can someone direct me / link me to it.

Thanks

Glyn

Keep on S4s'in

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Quick reply, but have not checked... :D

Charcoal canister purges to the inlet manifold through a hose

with a non return valve, is this the one you mean? It will be clear

on the evaporative loss system drawings in the manual if it is.

;)

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The one way purge valve you speak of is located near the inlet cam gear and timing belt. It is attached to the manifold by a small hose and appears as a small disc with hose ends. The other side of the purge goes to charcoal canister to draw in evaporative fumes from the gas tank. If the check vavle is not working it could backflow manifold gas through the fresh air intake of the evaporative system located under the right rear hatch gutter. There is a rollover valve located there under the gutter. In the gutter you will see 2 rather large phillips screws on the side of the gutter that is what holds the rollover valve in place. Many times this is a source of problems as the hose from the canister and fuel filler neck break in this region. To have a look you have to remove the right tank cover.

Good luck,

Calvin

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There is a rollover valve located there under the gutter. In the gutter you will see 2 rather large phillips screws on the side of the gutter that is what holds the rollover valve in place. Many times this is a source of problems as the hose from the canister and fuel filler neck break in this region. To have a look you have to remove the right tank cover.

Good luck,

Calvin

<{POST_SNAPBACK}>

Here's that exact rollover as it was on mine, nasty yellow hose

well hidden up there - and well rotton too! Had to drill out the fixings

as the bobbins (like all the ones on the car) just turned and turned

and turned, in that rusty but loose Lotus way...

http://uk.pg.photos.yahoo.com/ph/clarkycat...5c8.jpg&.src=ph

:D

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The one way purge valve you speak of is located near the inlet cam gear and timing belt. It is attached to the manifold by a small hose and appears as a small disc with hose ends. The other side of the purge goes to charcoal canister to draw in evaporative fumes from the gas tank. If the check vavle is not working it could backflow manifold gas through the fresh air intake of the evaporative system located under the right rear hatch gutter. There is a rollover valve located there under the gutter. In the gutter you will see 2 rather large phillips screws on the side of the gutter that is what holds the rollover valve in place. Many times this is a source of problems as the hose from the canister and fuel filler neck break in this region. To have a look you have to remove the right tank cover.

Good luck,

Calvin

<{POST_SNAPBACK}>

Thanks Calvin and guys, this is the one way valve that I read about (but maybe I dreamt it??)

As you may have guessed, I've got the smellies! but only on WOT with the window down.

What does the roll over valve do?

I need to look at the pics in more detail, but not when I've just got back from the pub !

Thanks for the replies so far, (did I really dream the thread?)

Glyn

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What does the roll over valve do?

As it is atached to a hose from the filler neck...

..i assume it stops petrol pissing through the canister

vapour hoses and going everywhere if the car rolls over?

:D

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As it is atached to a hose from the filler neck...

..i assume it stops petrol pissing through the canister

vapour hoses and going everywhere if the car rolls over?

;)

<{POST_SNAPBACK}>

Thanks Paul, so its for if you actually roll over..... doh never thought of that !

I've replaced the tank to tank breather pipe, it was actually OK but as I'd already bought the pipe I fitted it.

But I still smell....

I've checked the one way valve thats in the middle of some small diameter tubing near the auxillary pully, and I can blow through it only one way - it seems to be working, but on full throttle the pressure will be 15 psi? and could still fail?

Finally, I've not changed the pipes from the charcoal canister - what diameter do I need to buy, and what sort of length?

Oh, nearly forgot, those dreaded rubber elbows are everywhere, found another perished one near the right hand side fuel filler. I really need to get my head around what all these sensors actually do!). She feels much smoother now.

Thanks

Glyn

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Finally, I've not changed the pipes from the charcoal canister - what diameter do I need to buy, and what sort of length?

Mmm...

Well, i got 6mm bore and 4mm bore fuel lines.

In a REALLY annoying Lotus way, components either

end of the SAME pipe had different size fitments...

;)

So, i fit the smaller end on fine, but the other end i

covered the whole world in WD40, then twisted a phillips

screwdriver around in the end of the pipe in the hope of

making it more stretchy, then spent five minutes ripping

my fingernails off (heart pumping piss) only to get the

thing stuck half on the spout refusing to move.

Which i assume i is still doing now, as i left it so.

:)

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